Kinetic behavior of a rotating gold disk electrode modified with a self-assembled ferrocenecarboxamidoyl monolayer based on zirconium phosphonate

✍ Scribed by Hun-Gi Hong

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 752 KB
• Volume: 42
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/s0013-4686(96)00414-8

✦ Synopsis

rotating gold disk electrode was modified with a ferrocenecarboxamidoyl monolayer, which is ionically bound to a well-ordered zirconium phosphonate film on electrode surface. Voltammetric behaviors on a modified Au disk electrode have been studied in solutions containing electroactive species. This electroactive film with constant thickness of ca. 29 8, simultaneously shows not only an electron-transfer blocking property but also an electron-transfer mediating property. The limiting steady-state current was measured as a function of rotation rate and overpotential for monomer-mediated oxidation of Fe(CN):-and was analyzed to get kinetic parameter values (k,,, P', and cc) by a simulation fitting program. The extracted values of rate constant for the monomer/redox couple electron-exchange reaction and the irreversible charge transport reaction indicate that a relatively facile electron transfer reaction occurs in the high overpotential region even though the zirconium phosphonate film makes the electron propagation rate through the film slower.